Same Birthday Odds: Higher Than You Think! It stands to reason that same birthday odds for one person meeting another are 1/365 (365 days in the year and your birthday is on one of them). But consider this: If you get a group of 30 people together, two of them will almost definitely have the same birthday.Oct 3, 2014 read more
Statistics Blog > Same Birthday Odds It stands to reason that same birthday odds for one person meeting another are 1/365 (365 days in the year and your birthday is on one of them). read more
So the probability that out of the n number of people you meet, none of them have the same birthday as you is [math](\frac{364}{365})^n[/math]. So the probability that you meet at least 1 person who has the same birthday as you is [math]1-(\frac{364}{365})^n[/math]. read more
In probability theory, the birthday problem or birthday paradox concerns the probability that, in a set of n randomly chosen people, some pair of them will have the same birthday. By the pigeonhole principle, the probability reaches 100% when the number of people reaches 367 (since there are only 366 possible birthdays, including February 29). read more